Federal Report on Pennsylvania Site Foresees Costlier Work

The cleanup of a radioactive-waste dump in a small Pennsylvania town will likely be more complicated and potentially riskier than originally envisioned, and cost nearly 10 times as much, according to a revised federal plan.

Meanwhile, some officials, spurred by a citizen activist, are trying to determine whether all the waste in the area has been located.

Earlier this month, the Army Corps of Engineers released the revised...